It was interesting to watch the videos and see that for Fritz!box you can enable the inbuilt Packet capture utility by simple going to ….
192.168.178.1/html/capture.html
At least it is possible to use a third party GPON module but does require, packet capture, packet analysis (Wireshark) and some dedicated extra hardware (media converter) etc. etc. and is technically not ‘authorised’
Alas I do not own the RT-BE88U so cannot see the options the UI has for configuring the GPON SFP module, if any ? but will see if ASUS have any plans in this area 
In a completely sane world, madness is the only freedom (J.G.Ballard).
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